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Steedeite

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Formula:
NaMn
 
2
[Si
 
3
BO
 
9
](OH)
 
2
System:Triclinic
This page provides mineralogical data about Steedeite.

Classification of Steedeite

IMA status:Approved 2013
Explanation of status:A different material was originally approved as a new mineral (IMA 2010-049), but the approval was later withdrawn in October 2011 since further investigations had shown that the mineral is identical to catapleiite.

Subsequently a different mineral was submitted as IMA2013-052.
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Type Occurrence of Steedeite

Type Locality:Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Place of Conservation of Type Material:Type material is deposited in the collections of the Royal Ontario Museum, Queen’s Park, Toronto, Ontario, Canada, catalogue number M56489

Crystallography of Steedeite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 6.837(1) Å, b = 7.575(2) Å, c = 8.841(2) Å
α = 99.91(3)°, β = 102.19(3)°, γ = 102.78 (2)°
Ratio:a:b:c = 0.903 : 1 : 1.167
Unit Cell Volume:V 424.81 ų (Calculated from Unit Cell)
Morphology:Acicular crystals.
X-Ray Powder Diffraction:
d-spacingIntensity
8.454(100)
7.234(39)
3.331(83)
3.081(38)
2.859(52)
2.823(80)
2.477(21)
2.169(25)

Chemical Properties of Steedeite

Formula:
NaMn
 
2
[Si
 
3
BO
 
9
](OH)
 
2
Simplified for copy/paste:NaMn2[Si3BO9](OH)2
Essential elements:B, H, Mn, Na, O, Si
All elements listed in formula:B, H, Mn, Na, O, Si

Other Names for Steedeite

Synonyms:
IMA2010-049IMA2013-052
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Steedeite

Reference List:

- +
Haring, M.M. and McDonald, A.M. (2013) Steedeite, IMA 2013-052. CNMNC Newsletter No. 17, October 2013, page 3002; Mineralogical Magazine, 77, 2997-3005.

Internet Links for Steedeite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Steedeite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Montérégie
        • La Vallée-du-Richelieu RCM
          • Mont Saint-Hilaire
    Haring, M.M. and McDonald, A.M. (2013) Steedeite, IMA 2013-052. CNMNC Newsletter No. 17, October 2013, page 3002; Mineralogical Magazine, 77, 2997-3005.
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